This bug was report on https://bugs.edge.launchpad.net/ubuntu/+source/file-roller/+bug/228337

his bug is present in Hardy but it has been around for a long time. In file-roller, clicking the exit button at the top-right does not give you any warning if exiting would cancel an in-progress operation. For example, if you click exit while in the middle of extracting an archive, then it silently exits and leaves you with corrupt output sitting on disk. Similarly when creating an archive. This is a problem for small archives that the user expects to finish extracting immediately, because the user will probably click the exit button right away, which will give them corrupt data if the computer happens to be a little slow that time.

Ideally, clicking exit should block waiting for the current operation to complete, potentially timing out and displaying a prompt if that's taking too long.